feat: add some APIs to separate theme-related Setting and ConfigMap permissions

[guqing]

What type of PR is this?

/kind feature /milestone 2.2.x /area core /kind api-change

What this PR does / why we need it:

添加自定义 APIs 以分离主题对 Setting 和 ConfigMap 权限的依赖

⚠️ 此 PR 新增了 APIs，需要 Console 对其进行适配，主题菜单下获取激活主题的 API 以及查询主题 Setting、ConfigMap 的 APIs 需要更改。

Which issue(s) this PR fixes:

A part of #3069

Special notes for your reviewer:

how to test it?

• 测试 GET /themes/-/activation 此 endpoint 是否能正确获取到激活主题信息
• 测试 GET /themes/{name}/setting 是否能正确获取到主题名称对应的主题的 Setting，如果 name 为 - 表示查询当前激活主题的 Setting
• 测试 GET /themes/{name}/config 是否能正确获取到主题名称对应的主题的 ConfigMap, 如果 name 为 - 表示查询当前激活主题的 ConfigMap。
• 测试 PUT themes/{name}/config 是否能更新主题的 ConfigMap，如果名称不匹配则抛出异常。 切换用户为其分配主题的查看权限可以有权限调用以上描述的 GET 请求的 endpoints，管理权限可以调用 PUT themes/{name}/config。
• 测试 PUT /themes/{name}/activation 是否能设置激活主题。

/cc @halo-dev/sig-halo

Does this PR introduce a user-facing change?

添加自定义 APIs 以分离主题对 Setting 和 ConfigMap 权限的依赖

[ruibaby]

ping @halo-dev/sig-halo

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